From: Ian Romanick <[email protected]>
These patterns
gl_FrontFacing ? -1.0 : 1.0
gl_FrontFacing ? 1.0 : -1.0
gl_FrontFacing ? 0.0 : -1.0
are recognized and optimized by the i965 driver. However, it
incorrectly optimizes
int x = gl_FrontFacing ? 1 : -1;
as
int x = gl_FrontFacing ? floatBitsToInt(1.0) : floatBitsToInt(-1.0);
NOTE: This test currently fails on Mesa master and 10.5 branches.
v2: Add missing ] on vertex passthrough line. Noticed by Emil.
Signed-off-by: Ian Romanick <[email protected]>
---
.../fs-frontfacing-ternary-1-neg-1.shader_test | 32 ++++++++++++++++++++++
1 file changed, 32 insertions(+)
create mode 100644
tests/spec/glsl-1.10/execution/fs-frontfacing-ternary-1-neg-1.shader_test
diff --git
a/tests/spec/glsl-1.10/execution/fs-frontfacing-ternary-1-neg-1.shader_test
b/tests/spec/glsl-1.10/execution/fs-frontfacing-ternary-1-neg-1.shader_test
new file mode 100644
index 0000000..a6590c1
--- /dev/null
+++ b/tests/spec/glsl-1.10/execution/fs-frontfacing-ternary-1-neg-1.shader_test
@@ -0,0 +1,32 @@
+[require]
+GLSL >= 1.10
+
+[vertex shader passthrough]
+
+[fragment shader]
+uniform int front;
+uniform int back;
+
+const vec4 c = vec4(1.0, 0.0, 0.0, 0.0);
+void main()
+{
+ int f = gl_FrontFacing ? 1 : -1;
+ if (f == front) {
+ gl_FragColor = c.yxyx;
+ } else if (f == back) {
+ gl_FragColor = c.yyxx;
+ } else {
+ gl_FragColor = c.xyyx;
+ }
+}
+
+[test]
+uniform int front 1
+uniform int back -1
+
+draw rect -1 -1 2 1
+draw rect 1 0 -2 1
+relative probe rgba (0, 0) (0.0, 1.0, 0.0, 1.0)
+relative probe rgba (1, 0) (0.0, 1.0, 0.0, 1.0)
+relative probe rgba (0, 1) (0.0, 0.0, 1.0, 1.0)
+relative probe rgba (1, 1) (0.0, 0.0, 1.0, 1.0)
--
2.1.0
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